SOUTHBRIDGE — A box cutter-wielding pregnant woman allegedly slashed another woman in the neck, close to the victim's carotid artery and windpipe.

Idalis Rivera of 46 Old Sturbridge Road, Apt. 1, is charged with assault to murder and assault and battery with a dangerous weapon (box cutter). She was arraigned Thursday in Dudley District Court. Bail was set at $2,500. She is due back in court for a pretrial hearing on Sept. 26.

According to court documents, Ms. Rivera has no previous record, and no reason for the alleged altercation was given in the police report.

Shortly after midnight Thursday, police received word of a woman being treated for a knife wound to her neck at Harrington Memorial Hospital.

The victim suffered a severe 2-inch incision to the neck, close to her carotid artery and windpipe. In addition, she had three cuts to her right arm, two to her left arm and one to her leg, according to Officer Luis M. Torres' report.

Ms. Rivera was booked and treated medically because she is pregnant. Ms. Rivera told police she was attacked first, the police report said.

A box cutter was recovered at the scene of the incident, on Cross Street. Officers on the scene saw blood splattered consistent with the injuries suffered by the victim, according to the police report.